I just got [my first spool of PETG][1] and tried to calibrate an Ultimaker Cura profile for it on my Ender 3 today with limited success. 

I've had severe issues with the filament not sticking to the build surface, instead balling up around the edges of the nozzle tip. (*rather like [this post][2]*) Sometimes it sticks alright, but that happens properly > 50 % of the time. I've never seen this behavior with my PLA materials.

So far, I've only been trying to print [this calibration part][3].

**Relevant Profile Params:** (*let me know if I need to post more, I think these are the relevant ones*)

* Layer Height: 0.2 mm
* Temp
  * Nozzle: 240 °C
  * Bed: 60 °C
* Print Speed: 60 mm/s (*more specific params left to auto calculation*)
* Travel Speed: 300 mm/s (*max*)
* Cooling fan
  * Initial: 0 %
  * Fan Speed: 100 %
* Retraction
  * Distance: 5 mm
  * Speed: 50 mm/s
* Skirt min length: 250 mm

I was initially going by advice from [Thomas Sanlanderer's video on PETG][4], starting with 230 °C/70 °C, but when that really didn't work, I then tried the advice of a Reddit user (*can't relocate thread*) that said to try a lower bed temp. I then experimented with different bed temps in the 50's to mixed avail. Most other threads are talking about PETG + glass, which seems to work well with a PVA glue stick surface finish.

I'm getting a glass build surface soon (*as soon as GearBest can ship it from across the pond*), and I hear that will help, but in the meantime, I want to find a way to make it work with the fake Buildtak. What can I do to try to make this work better? My thinking is that the issue is with the bed config (*temp, surface, etc.*) and not with the nozzle temp, but I could be wrong.


  [1]: http://smile.amazon.com/Stronghero3D-Printing-Filaments-Accuracy-0-05mm/dp/B07HDZ9K22/
  [2]: https://3dprinting.stackexchange.com/questions/722/petg-collecting-on-the-extruder
  [3]: https://www.thingiverse.com/thing:37869
  [4]: https://www.youtube.com/watch?v=8_adY2K-YIc